ArticleJournal of applied clinical medical physics2026
Beam-axis stability during gantry rotation measured with scintillation dosimetry.
Article in Journal of applied clinical medical physics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeVolumetric modulated arc therapy (VMAT) requires high mechanical precision due to continuous gantry rotation. This study aims to investigate beam-axis stability during VMAT delivery and evaluate scintillation-based imaging as a complementary quality assurance (QA) tool.
methodsBeam-axis deviations were measured using a scintillation plate dosimeter, acquiring images at 5 frames per second in axial and coronal planes. Nine conformal arc beams with a field size of 1 × 1 cm
resultsShort-term reproducibility showed maximum standard deviations (SDs) of 0.05, 0.06, and 0.11 mm for 4 MV, 6 MV, and 6 FFF beams, respectively. Long-term reproducibility exhibited maximum SDs of 0.15, 0.13, and 0.19 mm, respectively. Angle-dependent variations were most prominent at gantry angles of 0° and ±180°, consistent with gantry sag under gravity. The 3D displacements between the radiation dose center and the beam axis remained below 1 mm across all energies: the average (maximum) displacement ranged from 0.47 mm (0.96 mm) to 0.52 mm (0.97 mm) for 4 MV, 0.41 mm (0.68 mm) to 0.44 mm (0.76 mm) for 6 MV, and 0.42 mm (0.88 mm) to 0.47 mm (0.95 mm) for 6FFF. No relevant differences were observed among the three EPID/XVI configurations, indicating that these devices have a minimal impact on gantry mechanical stability.
conclusionsScintillation-based imaging enables real-time, high-resolution evaluation of beam-axis stability during VMAT. Deviations were consistently within submillimeter accuracy, supporting its use as a complementary QA method to conventional tests.
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